Will b



Aug. 21, `1923.

w. PORTER DENTAL ENGINE HANDPIECE Originlfiled Nov. 12, 1920 NN W I Toall whom t'm'y concern; i y

Beit known that I, VILLV R, PoR'rER, a

and useful Improvements` in 'Dental-Engine,

vspecification, reference being V [companying drawings 10 My, invention;relates nar l Yclass of liandpiec'es in which thetool-actuat-` had to ythe ae.

' lcommon]y known"asall-cord? handpieces .the tool` byv means of athreaded lshank arranged to, bke `actuated by` a thumb-nutThe*principal'objectof.r my inventionis i `handpiece'with chuckoperating mechanism actuated to clampa `tool bya relative axial 4vsliding movement of certain ofthe yhandpiece a parts.`

r `Other objects of invention are to protating with the rotary spindlesv*butA permitting it t,ofreely(,iscillate with:` the natural lWn-kingi;movements of the handv of the op- -;erator. v-. l l" 345` My` inventionyfurthercomprehendsj.novel `ermitting the ready `injection .tSpecificallystaterhthev form my "ifnv-evnff I Y #anA all-cord?A Qrbelt-driven?7 handpiece omprising a clutch actuated tov clamp agt'ool4the inclinedgsurfacesof a wedge, 'and slidably s spindle Afor rotatlngsaid clutch, having a r l: tion with said spindle, byx'a coiledspringinoil chamber whose inlet isfnorniallyA closed .afspringplateyield'ingly engaging the inner walllof A; A* i 'Reismd iig. 21,1923;'

ci'itizenof the United States, andiagresident` i of Elmhurst, in thecounty of Queens, State l 5 of New York,` have invented certain new`isfa central longitudinal sectional 'viewof A,specified i I Handpieces,Aof which the following* is ad` my invention; iFig. 2 isl asimilarlongitudii y i nal sectional view ofsaidhandpiece having; ticularly tothat *inglparts are belt-driven, and .which alreg"v y Handpieces oftheall-cord type asherejto-A. 1 5":fore con structed were4providedlvvwith,l altooli y engaging chuck which was actuated, toclampfwhereby it 4was .advanced or retracted lwith -f ,20, 4respect to saidchuck to clamp or unclamp e, d

i i the forward; tubular spindlel engaged by "ithewedge slide, orcoupling-2 withl the back spindle or driving shaft 3, vand arranged ltorotated thereby within the casing colnf.; A'prisingthe tubular sheath orhand-hold 1 which is sli'dably mounted on the back spinto provider anall-cord?? or belt-driven` y 1 vide a handpiece'ofthe type contemplatedY. 30 with means to prevent "thesheath froml ro-l tion as hereinafterdescribed, vycom'prehendi-i means of a 'pivotedlever cooperative with;l

movable with respect vthereto a belt-driven i ybearing',mounted-inasupport and capablejof :oscillation therein, but prevented fromrotaterposed between said bearing'anditsigup'. `pormfsaid Support`beingprovided with'an V i {df/Ivlg Shaft Sjand ltsjbearin'g 5gThebear-f ingforslide 5 is .arrangedto `be.`rotatably v v"supportedY thewrist joint frame vv extel'i'sion-V DENTAL-ENGINE IHAN'D'PIE'CE.

1923. serialiNp; 622,643. Y

rous'` novel features of construction yand arrangement vas hereinaftermore definitely.-

.In the accompanying drawings, Figure 1 l a roairnn,vorfmirnuas'.Lifluini' yonk, Assrenoa zrQT1na:fs.fs.l WHITE'DENTLmmuracrunmecomrnlny, 'A 'coRroaATmN or rENNsYLvA'NIa y 'original No.1,408,907, dated 'Marcha v17922, vserial Np; 423,65aa1 .november 12,1920.* Apncuon `forreissueiilec March 3, Y

eoV

a handpiece constructed in accordance with its relatively' movableclamp-actuating, parts shaft andiwedge slide or ve taken axially Lofsaid hand on theline 5 5 in Fig.` 1.

d le bearing or slide vby its threaded leonnection with' the sleeve y orcollet v6 which is axiallyA extended to clamp the chuck on thef i 3v 1sa fragmentary :perspective l,

hef universal `@connection between w pli-11g; Fierffi isafragmentfractional' lView 'v t piece `on thefline. Ari-tirLFig. l; andFig. 5 isaj transverse i sectionalview takenv through the oil chamberv mountedyto slide longitudinally on said"l vbearing' or slide. Y

e is i in' 'thf'eadedf en lgagement with vthe-*rear endroit the shea-thA4, vand therefore, maybe adjusted axially there in andyretainedv in suchvadjusted position by i tliezsheath `adjusting lock nut 7 which is alsoin. threaded engagement with said sleeveor d colletg. y

The driving` vshaft .bearing orjslide. is

conveniently provided with the keyway'). f

vinto which the ,collet lkey. 10-A in the` colletl 6 may eXtendtoprevent t-herela'tivev rotation ofsaidA collet 6 and slide 5', butpermitting longitudinal;direction.

The slide or'bearing l l largedtoprovide a boss l2 against Awhichthe"spindle pulleyv13 on. theback-spi-ndle or dririjng shaft 3 rotates,and said jboss isy 5 haslitslrear end en- .their free relative movementin van axialfor flanged 'to provide -an annularlspacel'f' afl- Q. rangedto catch any fdrippin'gs Aof oil which may looze out between the abacklspindle or which is carried by thewrist joint frame 16 of lWell knownconstruction.k Y

The forwardend of the Wrist joint frame extension is provided with thethreaded boss 17 Which conveniently carries the tubular shield 19extended forwardly and disposed in telescopic relation with, the sheathor hand-hold` 4, and serving as a protection tothe exposed-oily exteriorsurface of the slide 5 when the sheath 4 is extended with respect tosaid slide 5 as shown in Fig. 2 to clampthe tool ashereinafterdescribed.

The bearing or slide 5 is prevented from rotating with the back spindleor drivingr shaft Shy the coiled spring 20 which ismterposedbetween theforward end of the Wrist joint frameY extension andthe shoulder 21formed by the head 22 ofthe nut r23, which is in threadedengagement'fwith the bearing 5 anda-rranged to hold the spring 2O undercompressionto provide suicient friction to prevent the slide 5 and thesheath '4 carried thereby from rotatingfwith the f the operator."

` i. The Wrist 'i vided with. the annular oil chamberk 25 surfittedthereinwvith su'Hicient loosenesstoY afford a substantially universaljoint Wherel by the rotation of the back spindle or ydriv- Y rotaryspindleror'driving shaft 3,. but'permitting the-1n to freely VoscillateVWith the natural Working movements of the handv of joint frameextensionlis p ro-` rounding the slide or bearing 5 and has the oilinlet aperture 26 Which is normally" lclosed by the oil retainingshutter 27 comvprisin the sheet metal spring Which is curve to conformto andclosely engage innerwall of said chamber and has one end 29 bentlaterally to engage a suitable recess or notch 30 in the inner'rwall 'ofsaid chamber 25, as best shown in Fig. 5. The slide or bearing 5 isprovided With the oil aperture '32 vopening into theoil chamber 25 andarranged to admit oil between the back spindle or driving shaft 3 andits bearing'.

`The Lforward end ofthe back spindle or 'drivingshaft .3 lisr enlargedtol form the cylindrical head and provided VWith the undercutytransversely extending slot 36,Y "which 1s arranged to receive the'T-headed.

projection 37 of the Wedge slide or coupling ing shaft 3 effects' the'rotation of said Wedge slide or coupling 2.'

Sai'd Wedge'slide 2 Aisprovided at its forward end with thelprojecting-key or Aspline 110 'extending into a suitable slotl or keyway41 inthe Wall of the forward spindle l which is mounted for rotationinthe sheath 4.

The forward end of said forward spindle 1 issupported in the conicalbearing 4?), and

the-,back end. is arranged to rotate in the 'bearing provided by thecylindrical'sheath thrust t, mounted 'in the' recess 45 vin theA Wall o*thebore of said sheath 4.'r An end bearing. Washer 4'6is .disposed inthe vv-which' carriesV the plunger tip 60 arranged bore of thesheathandv aords an end thrustbearing for the forwardlspindle 1.

The forward spindle 1 is provided With the transversely disposed slot,47 intersecting the slot 4:1 and' servin .as a bearing for the trunnionst9`of` the Y'ever 50, Which'is disposed for oscillation in the slot 51in the Wedge slide or coupling 2, and which has its free end inclinedtolbearagainst the serrated Wall 52 of said slot, so that said free endmay engage any one of the serrations and serve to lock the parts of thehandpiece in their relatively adjusted positions when extended, as shownin Fig. 2. f

The lever 50`is arranged to effect f the clamping ofthe tool A55 inthechuck 56, which is longitudinally split and provided at itsfoppositeends with conical surfaces respectively arranged to bear againstsimilarly inclined conical surfaces 57 f and 58, respec-V tively formedin theV bore of 'the forward spindle 1, and in the borev of the plunger59 to be engagedby the'` elborv 61 ofthe lever -j 50, so that when therelatively sulidable mem? bersV of the handpiecefare shifted tocause thelever` 50 to ride upon the serrated wall 52'7 theielho-W 61 forces theplunger 59 for rWardly againstthe chuck 56 and by coopi `eration of theconical ends of sai'd chuck with the conical surfaces 57 and 58, it iscontracted -to embrace the tool 55 therein with such pressure as tofirmly holdsaid tool in its'operative position.

The collet 6 is provided With the oil hole 62 which registersv witha-'suitable opening the annular chamber 65 between the driving shaft 3and its -bearing in the slide 5,

formed by thegreduced region 66 of said Y driving shaft 3. Said oil hole62 is normally covered bythe sheath 4 andis accessible by j the mereremoval of said sheath. V

The yboss 12 of the slide 5'is conveniently vprovided .with the aperture67 into Which a bodkin or other suitable tool maybe in`vr serted forholding said boss when itisidesired'tof remove or separate ithehandpiece parts by relative rotation.

It will be readilyV seen that the slightest Wear of the parts in theirbearings may be nut 7 and rotating the sheath 4 on the collet 6 untilthe adjustment ofthe bearings is attained, Which' adjustment may bev'maintained Said sheath n ut 7 may preferably besplit as shown:a t 70and'byits spring pressure tightly clamps the collet 6.

'63 in the slide 5.for the injection of oil into taken up by looseningthe sheathadjusting invention is advantageous in that the.

V parts ofthe handpiece rmay be taken 'apart `and assembledby theremoval of a single set screw 69 and theV sheath fi", Which permits theWithdrawal of the back spindle or driving by jamming thesheath-adjusting nut 7 into 'engagement VWith the end of the sheath 4.-.

f--isgesl shaftp lfrom its bearing in the slide 5, and; `Supportfor saidbearing-having an annular n when thus 'release'd'- fromv'saidl bearing,'the ""`,wedg e` `slide 2. may be 'separated'from-"saidf backspindle ordriving shaft 3 by` simply j g sliding them? 4oppositely vin? aV lateraldirecvtion tov releasegthe Tf'hea'd? ons'aid lWedgeslide 2, froml'theunder cut slot 36 inthev fhead l35 ofthe backfspindle or driving ishaft3. n Y C* f fF'urthermord'by the construction herein s'contemp1ated,fthe space 'betiveen'the .relatively "slidable 'meml'iers[is bridged by "the l 4shield 19, so as to .protect the oily exteriorsurface ofthe slidef5, and-therebyfprevent4 thehands `of the operatorfrom bemgsoiled lhaving an inlet extended through the Wall dfsaidvsu'pportyand a shutter-forjsaid inlet comprisingy a sheet springtending to engage said inlet. 4 6. A beltadrivenfdental 'enginehandpiece ing shaft, a bearing for 'said driving shaft inlet extendedthrough thewall offsaid sup# ,by Contact therewith- Q port, andayielding.shutter for said inlet f i: I t is tol :be understood thatthe'v`rmsFall-K- d` and-"Fbelt-driyenf in the"specifi cation'` fand claimsare' to beconsidered synonymous "andfrefer specifically to a'yvell-knowncon-f` ructionl ofi h'a-ndp1ece-V vvherein thel `back pindle ordriving-,shaftfthereof provided Withg' g'COrdf pulley rivhichI isdirectly Amount- ".edthereon, ands'ecured thereto, "forms an in "'gralfpart.

1560 not dSretQlimt lil. n,

" precisefdeta s of con struction and ar- 1 rangementasfh reinsetfforthasz itgis obvio'usv that' various. modifications'may-"be madetherein yvithout departing'froin the L essential featuresofmyinventionasdefined 1 in the appendedclailns.

Having thus described my invention, .I` c1ai m:4;`-`` 'z n `1. Abelt-driven dental enginehandpiece having a toolengaging clutch actuated'torip and release a tool vbyra lever .movable ongitudinally on aninclined surface. if 2.' A belt-driven dental 'engine handpiecev havingvrelatively movable tool ,clamping means arranged to' be actuated toclamp andr release va. tool by lrelatively slidingr saidv meanslongitudinally by a forward and backj Ward movement of the hand of theoperator. 45 f3. Av belt-driven dental engine handpiece n having asheath, a tool-engaging clutch ro.-V tatably mounted :in said sheath, a,support- `ing frame, and yielding'y means tending to prevent the4rotationof said sheath with `said clutch, butvpermittingV its relativero'-. Y

tary movement with respect to said frame.l

4. A l.belt-driven dental enginehandpiece lcomprising a driving' shaft,tool-holding means connected to be rotated by! said driving shaft, abearing for said driving shaft, a lsupport for said bearing,and a s ringin- 1 terposed between said support an bearing tending to' frictionallyp'reventthe rotation of saidlbear'ing with said shaft but permit- -Atingsthe relative rotary vmovement of said chamberl and tendingto closesaid inlet,``

7. Allbelt-driven dental engine handpi'ece comprising afdriving shaft,tool-holding means connectedl to tbe rotated by said drivingshafn'fabearing'for 'said driving Vshaft having an oil 'hole extendedtherethrough, Ia support for's'aid bearing comprising an an 1 said inletcomprising asheetspring substantiallyu'conformingl to the 'Wall of said'cham-' ber tending to close said inlet and having one end jthereofextended into vsaid notch or recess vto prevent its accidentaldisplacement.`

bination with a driving shaft having a belt or cord pulley thereon byWhichit may be rotated, vof a bearingA for said driving shaft saidslide, and arranged tobe shifted axially lthereon, a s tool-holding lclutch rotatably mounted in said sheath and 'connected to be eomprisingalever actuated by Nthe longi- Atudinal' movement. of said sheath on saiding ofsaid tool. ,n

pulley-` thereon by Which it is rotated, vof a'bearing for said drivingshaft providing a arranged to move axially With respect thereto, atool-holding clutch rotatably mounted clutch is rotated, and meansactuated by the and closingl of said chuck.r

' bearing and support. 5. A belt-dl'venv dental engine handpiece.comprising a drivingshat, atool-holding 1 means connected to be rotatedby said drivshaft, a bearing for said driving shaft,

pulley thereon by Which it Yis'rotated, of a oil 'chamberqembracing saidbearing, andl the Wjallfof said chamber and normallyfclose having an oilhole`tl 1erein, a support for said bejarln provided with an annular oilcham- Y ber em racing said bearing' and having an nular oil chamberdisposedf'in communica-" tion Withfsaid oil hole,'andharing a recess.'ori notch-I therein` and,` an .inlet extending-v throughthewallthereof,"v anda shutter for 8. I na dental engine handpiece, thecoln l bearing'to effect the clamping or the releasslide, asheathsupportedbyV said slide andv bearingfor saiddriving shaft providing a`slide, a support vfor said bearing, a spring Ysubstantially conformingto the Wall ofi-said y providing aA slide, a sheath supported byrotatedbyvsaid driving shaft, and means v 9411i a dental engmefhandpiece, thecombination with a driving shaft having a cord in said sheath, and alconnection comprisd y ing a substantially universal ointj betweenv saidclutch and/driving shaft whereby said relative longitudinal movement of4,said sheath and `said slide toeffect the opening.

' 10.` In a dental engine handpiece,'the comy bination with a drivingshaft having a cordl A; i unal interposed between said bearing anditssup-. V 'port tending to prevent the rotation of said I bearing Withsaid shaft but permitting its relative rotatable movement with respeetto said support, a eolletlongitudinally movable .on said slide, a sheathxearried by said collet, a hollow spindle rotatably mounted inl saidsheath, means eomprising'a universal joint vlongitudinal movement ofsaid collet on said.

.- chuck.

eonneoting'said' hollow spindle with said *driving shaft, atoolrengaging,clutch carried by said spindle, and means effectedv bySlide to clamp or release ai tool in .said

11. Ina dental engine handpieee, the comb ination with a drivingshafthaving a oord port, acollet longitudinally movableon ,saidv 25.slide, a. sheathcarried by saideollena hol-v pulley thereon bywvhioh it,is rotated, ofva bearingl for said driving shaft providing a slide, asupport for ysaid bearinga springl interposed between said vbearingandiA its support tending Vtolpreveiit the rotation oit said:

bearing with said shaft but permitting its relative rotation withrespect tosaidsup- Flow spindle rotatably mountedfin ,said

sheath, a WedgeA slide connecting said spin-- i dle withsaid drivingshaftand comprising fa universal joint,VV a tool .liuk earried byr saidspindle, and alever cooperative with' 4 said Wedge slide arranged .toaotuate said*v clutch .to grip @ndr-@lease D001 by th 1ongitudinalmovement of said collet on' Said slide.

ulley thereon by which it is rotated, of a learing for said driving'shaft p rovidinlg,r ia

12. In a `dental enginehandpieee, the clombination with a drivingshathaving a cord.

slide/,a support for saidbearing, a, spring interposed between saidbearing,l and its support, tending to prevent the rotation ofsaidbearing with lsaid s haft'hut permitting its relative rotationWith'vrespect to. saidsupporta collet longitudinally inovable on saidslide, a sheathearried by said eollet, a hollow spindle rotatablymounted i-jnsaidsheath, .a

yWedge slide connecting said spindle with said driving'shaft and comrising a univer: salrf]o1 nt,.a tool`ehuek carried by sald spindle, anda lever coopera-tive with said Wedge slide arranged to aotuatersaideluteh. to

grip and release a tool by thelongitudinal movementof said collet o-nsaid slide, and a.,

shield Carried by saidV support arranged vto protect the surac-e'of saidslide Vwhen said eollet'and saidslide Vare relatively extended.

Q13. In a dental engine handpieee ,theeorna support in which saidbearing is rotatably mounted, a nut in threaded engagement with saidbearing adjustable tovyardjand fromv said support, land Za' springinterposed between said .nut and said support tending to .prevent saidbearing from' rotating with said shaft but permitting its rotarymovement With'respeet to said "support,

my hand this 20th day of iFebruary, A. D.,

In Witness whereof, I have hereunto set bination WithA adriving shaft',of a. bearingV for .said driving sha-ft, means carrying .an operativetool actuated by said driving shaft, Y

